"We should have seen cheaper ULP and diesel prices on the back of falling oil prices, but the savings were swallowed up by the refiners, wholesalers and retailers who took the opportunity to fatten their margins," he said.

Ipswich unleaded was 145.9c per litre, 0.4 cents more than in Brisbane, the survey said.

Outside Ipswich diesel was cheapest in the north, averaging 150c in the Whitsundays, 150.4c in Townsville and 150.7c in Ayr.